Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d477ab9a4e4d42d…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 05:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d7509bace4ed71aab7f48fda4109e3c1 SHA-1: 21d1f46e4c6bf6028d72d3e9c103d8f9b5817ab4 SHA-256: 7d477ab9a4e4d42d4cf215284822c4702706408d6eb2d63bbe0624c21763820c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3549

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=epub+reader+tablet+android PDF link annotation
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4e3994dae8802287411076b166f5c6eb/dezotejivuponujazesibesij.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/50128456178.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/lalovusate.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/mukunebovosurosirujojofo.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/zokuzuvanexobinavu.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/nabuveravubad.pdfIn PDF document text
    • http://hrudolf.com/userfiles/lodoluve.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/3q5a4ru34pmj7nr3mbhv958f9f/75847167899.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/mafulideged.pdfIn PDF document text
    • https://hgb.se/filer/file/fetew.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/sojutasezoxo.pdfIn PDF document text
    • http://hydrem.ru/images/file/18885312357.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210909033027128.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/dasatufofuzufumefegok.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/futebus.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109121101522993.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/tudeleguvokugo.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/6752428477.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/24467613569.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/pisibigabizakemakina.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/34015182130.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/babesebidozenowi.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/mesosuj.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404d7904a17---53048853905.pdfIn PDF document text
    • http://th-hl.com///upload/files/polasoriwajokawape.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/95148542994.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 10440 bytes
SHA-256: 0307a5aa566b7b78067a9c55da9b02ca36ce2dd76634c88968c58a72531c36e7
font_01_sfnt_off00010f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F77 18284 bytes
SHA-256: 4235dd2fba0b2ae644205db22035c44357417b5397eb9d742a0aa31eb5716452